RunHandler typedef Null safety
- Zone self,
- ZoneDelegate parent,
- Zone zone,
- R f(
The type of a custom Zone.run implementation function.
Receives the Zone that the handler was registered on as self
,
a delegate forwarding to the handlers of self
's parent zone as parent
,
and the current zone where the error was uncaught as zone
,
which will have self
as a parent zone.
The function f
is the function which was passed to the
Zone.run of zone
.
The default behavior of Zone.run is
to call f
in the current zone, zone
.
A custom handler can do things before, after or instead of
calling f
.
Implementation
typedef RunHandler = R Function<R>(
Zone self, ZoneDelegate parent, Zone zone, R Function() f);